Mounting Section
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The Roller Follower is designed to accommodate a radial load; subjecting it to a thrust load could result in damage to the side plate or outer ring. Care must be taken in the design and assembly of the application to avoid or minimize any thrust component.
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For models NART, NAST-ZZ, and NURT, the specification table shows the minimum permissible diameter ("a") for the mounting section that comes into contact with the side plate. protect the side plate, please make sure the mounting section has the appropriate diameter. If the outer ring were to move in the thrust direction, due to installation error or the like, it could come into contact with the mounting, causing wear and dust from abrasion. To avoid this, THK recommends using a mounting with the configuration and specifications shown below.
- The surface hardness of the shaft to be used with a Roller Follower without inner ring must be between 54 and 64 HRC. For the surface roughness, we recommend Ra0.2 or below.
- For the mating raceway, see Track Load Capacity . .
- If the outer ring unilaterally or unevenly contacts the mating raceway, we recommend using a type whose outer ring circumference is spherically ground.
- The side plate of model NART is press-fitonto the inner ring. If the plate is pressed under an external force, it may cause abnormal rotation. Do not use the product in the manner that the side plate is pressed.
